Apparatus for tucking and folding

ABSTRACT

An assembly for tucking and folding a wrapper extension section which projects outwardly from the edge along at least two contiguous sides of an article. The assembly includes a tucker blade means located along a path of travel for the article to form a tuck portion in the extension section along at least a first edge of the article. A straight edge section disposed on the tucker blade member is used to hold the tuck portion against the side of the article as it moves along the path. A first folder member located along the path is used to crease an overfold portion of the extension section along a second edge the article and over the tuck portion. The straight edge section is effective to prevent the tuck portion from changing position beneath the overfold portion. A straight edge section is disposed at a height along the path to be contiguous to the second edge of the article along which the overfold portion is being bent. An inclined edge acts to crease the overfold portion along the second edge of the article while the straight edge section performs its function. The assembly may be used in combination with any packaging machine to effect the desired results.

ilnited States Patent [191 Andersen May 14, 1974 APPARATUS FOR TUCKINGAND FOLDING [75] Inventor: Andrew W. Anderson, West Caldwell, NJ.

[73] Assignee: Scandia Packaging Machinery Company, North Arlington, NJ.

[22] Filed: July 29, 1971 [21] Appl. No.: 167,510

Related US. Application Data [63] Continuation of Ser. No. 858,370,Sept. 16, i969,

abandoned.

52 Us. Cl. 53/378, 53/230 [51] Int. Cl B65b 11/42, B65b 49/04 [58] Fieldof Search 53/230-233, 53/378, 379

[5 6] References Cited UNITED STATES PATENTS 1,472,096 [0/1923 Streich'53/379 1,873,060 8/l932 Smith 53/230 3,005,298 l0/l96l .lohansen et al.53/378 X 3,372,526 3/1968 Anderson..l... 53/230 3,286,438 ll/l966 Sol53/379 Primary Examiner-Roy Lake Assistant Examiner-Neil AbramsAttorney, Agent, or Firm-Markva & Smith [57] ABSTRACT An assembly fortucking and folding a wrapper extension section which projects outwardlyfrom the edge along at least two contiguous sides of an article. Theassembly includes a tucker blade means located along a path of travelfor the article to form a tuck portion in the extension section along atleast a first edge of the article. A straight edge section disposed onthe tucker blade member is used -to hold the tuck portion against theside of the article as it moves along the path. A first folder memberlocated along the path is used to crease an overfold portion of theextension section along a second edge the article and over the tuckportion. The straight edge section is effective to prevent the tuckportion from changing position beneath the overfold portion. A straightedge section is disposed at a height along the path to be contiguous tothe second edge of the article along which the overfold portion is beingbent. An inclined edge acts to crease the overfold portion along thesecond edge of the article while the straight edge section performs itsfunction. The assembly maybe used in combination with any packagingmachine to effect the desired re- I sults.

9 Claims, 13 Drawing Figures Zea m 7 PATENTEDHAY 14 mm sum 1 or 3\I\J\IL- I\ITOR BY QNDEEW W. ANDERSON ATTORNEYS EATENTED MAY 14 i974SHEEI 2 OF 3 INVENTOR W W. ANDERSON I n-r TO RNEIvs PATENTEB MAY 14 i974SHEET 3 BF 3 INVENTOR ANDREW W ANDERSON I APPARATUS FOR TUCKING ANDFOLDING STATUS OF APPLICATION This application is a continuation ofapplicants application Ser. No. 858,370 filed Sept. 16, 1969, nowabandoned.

BACKGROUND OF THE INVENTION The method and apparatus for folding andtucking portions ofa package in a machine are generally known in theprior art. The US. Pat. No. 2,400,682 discloses a wrapper foldingmechanism which incorporates a tucking and folding. assembly forperforming the general method of bending an overfold portion over a tuckportion. The wrapper folding mechanism incorporates a stationary tuckerblade 130 and folder members which together form a planar wall structureincluding slots 131 and 132 which have a substantially uniform width andare located between the tucker blade 130 and said folder members. Theend folds a, b, c and d as shown in FIGS. -8 of that patent are effectedby the wrapper folding mechanism as follows: l The second end fold b isformed by the stationary tucker blade 130 disposed at the sides of thetable used in the construction of the packaging machine. (2) The .thirdend fold c as shown in FIG. 7 is passed through a slot 131 formedbetween a stationary block and the tucker blade 130 and thereby foldedinwardly and downwardly. (3) The four end fold d as shown in FIG. 8 ispassed through a slot 132 and thereby folded inwardly and upwardly. Theslots 131 and 132 are formed in walls located at both sides of thesupporting work table. The present invention constitutes an improvementin this prior art structure.

A more recent US. Pat. No. 3,286,438 discloses a mechanism and apackaging machine for closing the open ends of the wrapper appliedaround a box or other similar article. The patentee in this patent isconcerned about the adjustability characteristics of a mechanism similarto that disclosed in the above described assemblyof the prior art. I

It is the general desire in the packaging industry to obtain a finishedproduct having structural features which have both a pleasant and goodappearance and at the same time have a highly effective, functional'capacity. It has been found that in prior art assemblies such asdescribed hereinabove, generally, symmetrical end wrappingconfigurations are not consistently produced. Therefore, the packageshave an irregular appearance. In addition, it has been found that thetucked portions located beneath the overfold portions tend to bunch upor shift while the overfold portion is being bent over and pressedagainst the side of the article. Consequently, the generallynon-symmetrical package is obtained and the functional use of thepackage is adversely affected. Functionally speaking, it is desirable tohave a closed package so that the products inside the package willnot'be subjected to the atmosphere and thus dry out. This is of utmostimportance in the cigarette industry wherein it is desired to have thetobacco products maintain their freshness over an extended period oftime.

PURPOSE OF THE INVENTION It is the primary object of this invention toprovide an apparatus for tucking and folding portions of a wrapperextension which results in a tightly wrapped configuration.

It is another object of this invention to obtain a wrapped producthaving a symmetrical visual appearance thereby enhancing theattractiveness of the package.

A further object of the invention is to obtain a wrapped article thatwill ensure freshness of the package material over an extended period oftime.

It is another object of this invention to provide an improved apparatuswhich performs the method of the invention in an effective and efficientmanner while overcoming the basic disadvantages associated with priorart devices.

SUMMARY OF THE INVENTION The process for tucking and folding portions ofa package in a machine includes the step of holding at least a firsttuck portion against the side of the article while bending anoverfoldportion over the tuck portion. The tuck portion is held againstthe side of the article until a crease has been formed along the secondedge of the article to prevent the tuck portion from changing positionsbeneath the overfold portion. It has been found that with prior artdevices the shifting of the tuck portion takes place while the overfoldportion is being creased along the second edge of the article. For thisreason, the method of holding the tuck portion under the conditions asset forth hereinabove clearly provides a better wrapped product andovercomes disadvantages which are attendant the prior art methods andapparatus.

The assembly for tucking and folding a wrapper extension sectionincludes holding means which press the tuck portion against the side ofthe article while folding means are provided to crease the overfoldportion of the extension section along a second edge of the article. Thespecific holding means in a particular embodiment of this inventionincludes'a straight edge section located on a stationary tucker blademeans which wipes the tuck portion of the extension against the side ofthe article. The tuck portion holding means has an overlappingrelationship with respect to the folding means. The straight edgesection is disposed on the packaging machine to be contiguous to thesecond edge of the article beneath the overfold portion while thebending means acts to crease the overfold portion along the second edgeof the article. In this manner, the second edge section prevents thetuck portion from changing position beneath the overfold portion. Thisassembly may be used in combination with any packaging machine whichforms an extension section that projects outwardly from the edges of atleast two contiguous sides of an article.

BRIEF DESCRIPTION OF DRAWINGS Other objects of this invention willappear in the following description and appended claims, reference beingmade to the accompanying drawings forming a part of the specificationwherein like reference charac ters designate corresponding parts in theseveral views.

FIG. 1 is a perspective view of a prior art packaging machineincorporating an assembly made in accordance with this invention,

FIG. 2 is an exploded perspective view of selected portions of the priorart machine showing various wrapping stages effected in the process ofthis invention,

FIG. 3 is a side elevational view of an assembly for tucking and foldinga wrapper extension in accordance with this invention,

FIG. 4 is a side elevational view of a top folder member used in anassembly made in accordance with this invention,

FIG. 5 is a side elevation view of a stationary tucker blade means in anassembly made in accordance with this invention,

FIGS. 6 through 13 are sectional views taken along the several lines6-13 on FIG. 3 showing the various positions of an article and a wrapperwhen passing through the folding and tucking assembly made in accordancewith this invention.

DESCRIPTION OF SPECIFIC EMBODIMENTS More specifically, a wrappingmachine, generally designated 1, incorporates an assembly la to effectthe folding of an extension section formed from a web of materialwrapped around the article 2. The articles 2 are loaded into the supplymagazine 3. A conveying means such as a continuous chain 4 moves thearticles 2 from the supply magazine 3 forwardly through the variousstages of the wrapping machine 1. The article 2 moves along the supportplate 5.

The sheet of wrapper material 15 is supplied from a primary supply roll6. A reserve supply roll 7 is provided to insure rapid and continuouspackaging of the articles 2 as they are forwarded through the machine 1.The web of wrapper material 15 passes over either of the idler rollers 8or 9, depending upon which supply roll is being used. The idler rollers8 and 9 are supported at either end of a support bar 10. A roller feedmechanism 11 draws the wrapper material 15 from the supply roll 6. Acutting device 12 separates the sheet of wrapping material 15 so that itmay be wrapped around the article 2, as shown in FIG. 2. n

The conveying chain 4 thrusts the article 2 into a pocket of the turretwheel 13. The tucker blades 16located at the end of each of the pocketson the turret wheel 13 cause the wrapper extension to be folded inwardlytoward each end of the article 2. The turret wheel 13 rotates on thesupport shaft 14 and the wrapper 15 is sealed along the longitudinalside of the article 2 by the folding mechanism, generally designated 17.A folding wiper blade 19 and a heat sealer 18 are used in cooperationwith each other to form the seal along the longitudinal edge of of theside of the article 2.

The wrapper feed mechanism 11, the operation of the conveying chainmeans 4, and the functioning of the turret wheel 13 in correlation withthe folding mechanism 17 are all generally known in the prior art.Portions of the wrapping machine 1 have been eliminated from the FIG. 1to satisfactorily show the interrelationship between the various workingstructural elements of the combination. Since the general relationshipbetween and among the various sub-combinations of this wrapping machine1 are generally known, as shown in US. Pat. No. 2,400,682, the detailedmanner and operation of their mechanical structure is not deemednecessary to fully explain the invention of this disclosure.

The method of tucking and folding portions of a package as presented inthis disclosure comprises the following steps: (1) providing a wrapperhaving an extension section which projects outwardly from the edges ofat least two contiguous sides of an article. (2) Thrusting at least afirst tuck portion of the extension section inwardly to form a foldalong a first edge of the article with the tuck portion being against aside intersecting said two contiguous sides. The tuck portion is placedbeneath an overfold portion located along a second edge of the article.(3) Holding the tuck portion against said intersecting side of thearticle while bending the overfold portion of the extension sectionalong the second edge of the article. (4) Maintaining the holding stepuntil a crease has been formed along the second edge of the article toprevent the tuck portion from changing position beneath the overfoldportion. (5) Pressing the overfold portion against the side of thearticle and over the tuck portion to form a snugly wrappedconfiguration.

Once the folding mechanism 17 has operated to seal the wrapper along onelongitudinal side of the article 2, the extension section of the wrapperis formed on either end of the pocket, as shown in FIG. 2. As thepartially wrapped article 2 moves from the turret wheel 13, it comesinto contact with a stationary tucker blade A. This tucker blade A wipesacross the end of the article 2 and forms the tucked portion II. Thetucked portion I has been formed by tucker blades 16 when the webmaterial 15 and article 2 have entered the pocket of the turret wheel13. The tucked portion II is formed when the article 2 moves along thesupport plate 5. As shown in FIG. 3, the overfold portion III movesbetween the stationary tucker blade A and the top support plate 20. Theoverfold portion IV moves between the bottom support plate 5 and thetucker blade A. In this specific embodiment, a short top extensionmember 21 is shown over the initial tucking portion of the blade meansA.

As the article 2 passes forwardly along the assembly of FIG. 3, thetucked portions I and II are held in place along the edge of the article2 beneath the overfold portion III. Straight edge section 22 of thestationary blade means A is used to hold the tucked portions I and II inposition until the partially wrapped article 2 passes the tuck releasestep 24. While the straight edge section 22 is pressing the tuckedportions I and II against the side of the article 2, the folder member Bis effecting the bending of the overfold portion III downwardly with thefolding surface 23a. The overlapping relationship as shown in FIG. 3between the straight edge section 22 and the folding surface 23a allowsthe overfold portion III to be folded downwardly and to be creasedbefore the tucked portions are released along the edge of the article 2.

As is generally known in the prior art, the stationary tucker blade A isslightly concave in cross section to prevent the catching of any tuckedportion beneath the overfold portions. That is, the structure willreduce drag on the tuck along the end of the article 2 being wrapped. Inaddition, the adhesive material used on the ends will not be wiped offby the concave shaped tucker blade means A. As indicated, this is agenerally known characteristic of tucker blades used in the prior artand does not form a part of this invention.

As is evident from the drawings, folder member B includes an inclinedfolding surface 23a, a gradual pressing surface 23b and a final pressingsurface 230. Once the crease has been formed by folding surface 23aalong the second edge of the article 2, the overfold portion "I ispressed against the end of the article 2 by the pressing surfaces 23band 23c, as shown in FIG. 9. The length of the straight edge section 22with respect to the inclined folding surface 23a is a function of thetype of material being used in the packaging operation. It is also afunction of the size of the packages that are involved. Once the basicrelationship has been shown as disclosed herein, it is within theordinary skill of the art to determine the various interrelationshipswhich must exist between the various structural elements to obtain theoptimum results necessary for the particular texture of material beingused.

A further feature of this specific embodiment provides a second straightedge section 25 located along the bottom of the folder member B. Thesecond straight edge section 25 holds the tucked portions I and IItightly beneath the lower overfold portion IV while the overfold portionIV is being bent upwardly and inwardly with respect to the end of thearticle 2. The 2 holding of the tucked portions l and II against theside of the article 2 is maintained until the package passes the tuckrelease step 27 located on the top folder member B. The lower overfoldportion IV is moved upwardly as the package 2 longitudinally moves alongthe second folder member C which includes an upwardly extending andinclined folding edge 26. The second straight edge section 25 and theinclined edge 26 of the lower folder member C have an overlappingrelationship, as seen in FIGS. 3 and 10. This relationship enables thetucked portions l and II to be held against the side of the article 2until the lower overfold portion IV has been creased.

As is evident in the drawings, the stationary tucker blade A and thefirst folder member B have planar surfaces disposed in a first planewhich is parallel to the direction of movement of the article 2 past theassembly. The second straight edge section 25 is located on the firstfolder member B and is disposed in said first plane. As is further seenin the drawings, the inclined,

folding edge portion 26 is located in a second plane which intersectsthe first plane that includes the pressing surfaces of the stationarytucker blade A and the upper folder member B. That is, the inclined edge26 begins at an offset location, as shown in FIG. 10, and graduallymoves inwardly toward the side of the article 2 as well as causing thelower overfold portion IV to bend upwardly against the top folder memberB. This is sequentially shown in FIGS. through 13. This configurationprevents bunching of the wrapper material between the second straightedge section and the inclined folding edge portion 26. 1

ADVANTAGES OF THE INVENTION The process and assembly used to effect theprocess produce a wrapped package that has a symmetrical fold locatedalong one side of the article 2. This symmetrical fold is especiallyimportant when transparent material, such as cellophane, is used as thewrapper material 15. In addition, the process and assembly of thisinvention insures a snugly wrapped configuration which will insure addedprotection of the contents of the article from the effects of theatmosphere. That is, the materials wrapped within the wrapper material15 may be maintained in a fresh state over an extended period of time.

While the process and apparatus for tucking and folding has been shownand described in detail, it is obvious that this invention is not to beconsidered as being limited to the exact form disclosed, and thatchanges in detail and construction may be made therein within the scopeof the invention, without departing from the spirit thereof.

I claim:

I. An assembly for tucking and folding a wrapper extension section whichprojects outwardly from the edges along at least two contiguous sides ofan article which is moving along a path that extends in a directionperpendicular to the extension section, said article having arectangular cross-section and the wrapper extension section having had atubular configuration projecting outwardly from the four edges of thearticle, said assembly comprising:

I a. first stationary tucker blade means located along said path to wipea tuck portionin the extension along a first edge of the article andagainst a side intersecting said two contiguous sides,

b. second stationary means for holding the tuck portion against saidintersecting side as the article moves along said path, and

c. a first folder member located along said path for folding a firstoverfold portion of the extension section along a second edge of thearticle against said intersecting side,

(1. said first folder member having an inclined edge portion in spacedrelationship to the stationary tucker blade means at a distanceeffective to receive the overfold portion of the extension section andcause the overfold portion to bend inwardly with respect to the articleover the tuck portion,

e. said second stationary means including a first straight edge sectionwhich is located on the stationary tucker blade means and is inoverlapping relationship with respect to the first folder member wherebythe tuck portion is held in place against said intersecting side,

flsaid first straight edge section being disposed contiguous to thesecond edge of the article to support the tuck portion beneath the firstoverfold portion at the crease line and to prevent the tuck portion fromchanging position therebeneath until said first folder member acts tocrease the overfold portion along the second edge,

g. a second straight edge section located on the first folder member andbeing disposed contiguous to a third edge of the article opposite thesecond edge thereof, and

h. a second folder member having an inclined folding edge portion inspaced relationship to the second straight edge section at a distance toreceive a second overfold portion of the extension section facing afirst overfold portion thereof and to cause the second overfold portionto bend inwardly with respect to the article over the tuck portion heldby said second straight edge section,

. said second straight edge section being in an overlapping relationshipto the second folder member,

j. said stationary tucker blade means and said first folder memberhaving planar surfaces disposed in a first plane which is parallel tothe direction of movement of said intersecting side of the article pastthe assembly, and

k. said second straight edge section of said first folder member isdisposed in said first plane and said inclined folding edge portion isdisposed in a second plane that intersects said first plane to preventbunching of the wrapper material between the second straight edgesection and the inclined folding edge portion of said second foldermember.

2. In a stationary tucking and folding mechanism including a tuckerblade means and at least a first folder member forming a planar wallstructure including a slot having a substantially uniform width andlocated between the tucker blade means and the folder member, saidmechanism being mountable along a path traveled by an article having awrapper extension section projecting outwardly from the edges thereof,said mechanism being effective to form a tuck portion in the extensionsection along a first edge of the article and then bend an overfoldportion thereover as the article moves along the path, the combinationcomprising:

a. a straight edge section located on the tucker blade means and inoverlapping relationship with respect to the first folder member alongsaid slot,

b. said slot having a configuration to receive the overfold portion ofthe extension section and cause the overfold portion to bend inwardlywith respect to the article over the tuck portion,

c. said straight edge section being disposed at a height along said pathto be contiguous to a second edge of the article to support the tuckportion beneath the overfold portion at the crease line to prevent thetuck portion from changing position therebeneath while the first foldermember acts to crease the overfold portion along said second edge of anarticle.

3. In a mechanism as defined in claim 2 wherein a second folder memberis disposed adjacent said first folder member to form another portion ofthe planar wall structure with a second slot having a substantiallyuniform width and located between the first folder member and the secondfolder member,

said second slot having a configuration to receive a second overfoldportion of the extension section and cause the second overfold portionto bend inwardly with respect to the article over the tuck portion andfirst overfold member, and

a second straight edge section is located on the first folder member andin overlapping relationship with respect to the second folder memberalong said second slot,

said second straight edge section being disposed at a height along saidpath to be contiguous to a third edge of the article to support the tuckportion beneath the second overfold portion at the crease line toprevent the tuck portion from changing position therebeneath while thesecond folder member acts to crease the second overfold portion alongsaid third edge of the article.

4. In a mechanism as defined in claim 3 wherein said tucker blade means,first folder member and second folder member are disposed in order alongsaid path whereby the functions thereof are performed sequentially.

5. In a mechanism as defined in claim 3 wherein the second folder memberhas an inclined edge portion in spaced relationship to the secondstraight edge section.

6. In a stationary tucking and folding mechanism including a tuckerblade means and at least a first folder member forming a planar wallstructure including a slot having a substantially uniform width andlocated between the tucker blade means and the folder member, saidmechanism being mountable along a path traveled by an article having awrapper extension section projecting outwardly from the edges thereof,said mechanism being effective to form a tuck portion in the extensionsection along a first edge of the article and then bend an overfoldportion thereover as the article moves along the path, the combinationcomprising:

a. a straight edge section located on the tucker blade means and inoverlapping relationship with respect to the first folder member alongsaid slot,

b. said slot having configuration to receive the overfold portion of theextension section and cause the overfold portion to bend inwardly withrespect to the article over the tuck portion,

0. said straight edge section being disposed at a height along said pathto be contiguous to a second edge of the article to support the tuckportion beneath the overfold portion at the crease line to prevent thetuck portion from changing position therebeneath while the first foldermember acts to crease the overfold portion along said second edge of anarticle,

d. said stationary planar wall structure including a pressing means forholding the overfold portion against said intersecting side of thearticle and over the tuck portion to form a snugly wrappedconfiguration.

7. In a mechanism as defined in claim 6 wherein said pressing meansincludes a concave pressing surface and a planar final pressing surface,

said concave and planar surfaces being stationary and forming a portionof said wall structure.

8. In a stationary tucking and folding mechanism including a tuckerblade means and at least a first folder member forming a planar wallstructure including a slot having a substantially uniform width andlocated between the tucker blade means and the folder member, saidmechanism being mountable along a path traveled by an article having awrapper extension section projecting outwardly from the edges thereof,said mechanism being effective to form a tucked portion and then bend anoverfold portion thereover as the article moves along the path, saidfolder member including:

a. a folding surface, a concave gradual pressing surface and a flatpressing surface,

b. said slot having a configuration to receive the overfold portion ofthe extension section and cause the overfold portion to bend inwardlywith respect to the article over the tucked portion, and

c. said folding surface'and gradual pressing surface being contiguous tosaid slot configuration.

9. In a stationary tucking and folding mechanism including a tuckerblade means and at least a first folder member forming a wall structurehaving a slot located between the tucker blade means and the foldermember, said mechanism being mountable along a path traveled by anarticle having a wrapper extension section projecting outwardly from theedges thereof, said mechanism being effective to form a tuck portion inthe extension section along a first edge of the article and then bend anoverfold portion thereover as the article moves along the paty, thecombination comprising:

a. a straight edge section located on the tucker blade means and inoverlapping relationship with respect to the first folder member,

b. said slot having a configuration to. receive the overfold portion ofthe extension section and cause the overfold portion to bend inwardlywith respect to the article over the tuck portion,

c. said straight edge section being disposed at a height along said pathto be contiguous to a second edge of the article to support the tuckportion beneath the overfold portion at the crease line to prevent thetuck portion from changing position therebeneath while the first foldermember acts to crease the overfold portion along said second edge of anarticle,

d. a second folder member disposed adjacent said first folder member toform another portion of the wall structure with a second slot locatedbetween the first folder member and the second folder member,

e. said second slot having a configuration to receive a second overfoldportion of the extension section and cause the second overfold portionto bend inwardly with respect to the article over the tuck portion andfirst overfold member, and

f. a second straight edge section located on the first folder member andin overlapping relationship with respect to the second folder member,

g. said second straight edge section being disposed at a height alongsaid path to be contiguous to a third edge of the article to support thetuck portion beneath the second overfold portion at the crease line toprevent the tuck portion from changing position therebeneath while thesecond folder member acts to crease the second overfold portion alongsaid third edge of the article,

h. said stationary tucker blade means and said first folder memberhaving planar surfaces disposed in a first plane which is parallel tothe movement of the intersecting side of the article past the assembly,and

i. said second straight edge section of said first folder member isdisposed in said first plane,

j. said second folder member includes an inclined folding edge portionwhich is disposed in a second plane that intersects said first plane toprevent bunching of the wrapper material between the second straightedge section and the inclined folding edge portion of said second foldermember;

1. An assembly for tucking and folding a wrapper extension section whichprojects outwardly from the edges along at least two contiguous sides ofan article which is moving along a path that extends in a directionperpendicular to the extension section, said article having arectangular cross-section and the wrapper extension section having had atubular configuration projecting outwardly from the four edges of thearticle, said assembly comprising: a. first stationary tucker blademeans located along said path to wipe a tuck portion in the extensionalong a first edge of the article and against a side intersecting saidtwo contiguous sides, b. second stationary means for holding the tuckportion against said intersecting side as the article moves along saidpath, and c. a first folder member located along said path for folding afirst overfold portion of the extension section along a second edge ofthe article against said intersecting side, d. said first folder memberhaving an inclined edge portion in spaced relationship to the stationarytUcker blade means at a distance effective to receive the overfoldportion of the extension section and cause the overfold portion to bendinwardly with respect to the article over the tuck portion, e. saidsecond stationary means including a first straight edge section which islocated on the stationary tucker blade means and is in overlappingrelationship with respect to the first folder member whereby the tuckportion is held in place against said intersecting side, f. said firststraight edge section being disposed contiguous to the second edge ofthe article to support the tuck portion beneath the first overfoldportion at the crease line and to prevent the tuck portion from changingposition therebeneath until said first folder member acts to crease theoverfold portion along the second edge, g. a second straight edgesection located on the first folder member and being disposed contiguousto a third edge of the article opposite the second edge thereof, and h.a second folder member having an inclined folding edge portion in spacedrelationship to the second straight edge section at a distance toreceive a second overfold portion of the extension section facing afirst overfold portion thereof and to cause the second overfold portionto bend inwardly with respect to the article over the tuck portion heldby said second straight edge section, i. said second straight edgesection being in an overlapping relationship to the second foldermember, j. said stationary tucker blade means and said first foldermember having planar surfaces disposed in a first plane which isparallel to the direction of movement of said intersecting side of thearticle past the assembly, and k. said second straight edge section ofsaid first folder member is disposed in said first plane and saidinclined folding edge portion is disposed in a second plane thatintersects said first plane to prevent bunching of the wrapper materialbetween the second straight edge section and the inclined folding edgeportion of said second folder member.
 2. In a stationary tucking andfolding mechanism including a tucker blade means and at least a firstfolder member forming a planar wall structure including a slot having asubstantially uniform width and located between the tucker blade meansand the folder member, said mechanism being mountable along a pathtraveled by an article having a wrapper extension section projectingoutwardly from the edges thereof, said mechanism being effective to forma tuck portion in the extension section along a first edge of thearticle and then bend an overfold portion thereover as the article movesalong the path, the combination comprising: a. a straight edge sectionlocated on the tucker blade means and in overlapping relationship withrespect to the first folder member along said slot, b. said slot havinga configuration to receive the overfold portion of the extension sectionand cause the overfold portion to bend inwardly with respect to thearticle over the tuck portion, c. said straight edge section beingdisposed at a height along said path to be contiguous to a second edgeof the article to support the tuck portion beneath the overfold portionat the crease line to prevent the tuck portion from changing positiontherebeneath while the first folder member acts to crease the overfoldportion along said second edge of an article.
 3. In a mechanism asdefined in claim 2 wherein a second folder member is disposed adjacentsaid first folder member to form another portion of the planar wallstructure with a second slot having a substantially uniform width andlocated between the first folder member and the second folder member,said second slot having a configuration to receive a second overfoldportion of the extension section and cause the second overfold portionto bend inwardly with respect to the article over the tuck portion andfirst overfold member, and a second straight edge section is located onThe first folder member and in overlapping relationship with respect tothe second folder member along said second slot, said second straightedge section being disposed at a height along said path to be contiguousto a third edge of the article to support the tuck portion beneath thesecond overfold portion at the crease line to prevent the tuck portionfrom changing position therebeneath while the second folder member actsto crease the second overfold portion along said third edge of thearticle.
 4. In a mechanism as defined in claim 3 wherein said tuckerblade means, first folder member and second folder member are disposedin order along said path whereby the functions thereof are performedsequentially.
 5. In a mechanism as defined in claim 3 wherein the secondfolder member has an inclined edge portion in spaced relationship to thesecond straight edge section.
 6. In a stationary tucking and foldingmechanism including a tucker blade means and at least a first foldermember forming a planar wall structure including a slot having asubstantially uniform width and located between the tucker blade meansand the folder member, said mechanism being mountable along a pathtraveled by an article having a wrapper extension section projectingoutwardly from the edges thereof, said mechanism being effective to forma tuck portion in the extension section along a first edge of thearticle and then bend an overfold portion thereover as the article movesalong the path, the combination comprising: a. a straight edge sectionlocated on the tucker blade means and in overlapping relationship withrespect to the first folder member along said slot, b. said slot havingconfiguration to receive the overfold portion of the extension sectionand cause the overfold portion to bend inwardly with respect to thearticle over the tuck portion, c. said straight edge section beingdisposed at a height along said path to be contiguous to a second edgeof the article to support the tuck portion beneath the overfold portionat the crease line to prevent the tuck portion from changing positiontherebeneath while the first folder member acts to crease the overfoldportion along said second edge of an article, d. said stationary planarwall structure including a pressing means for holding the overfoldportion against said intersecting side of the article and over the tuckportion to form a snugly wrapped configuration.
 7. In a mechanism asdefined in claim 6 wherein said pressing means includes a concavepressing surface and a planar final pressing surface, said concave andplanar surfaces being stationary and forming a portion of said wallstructure.
 8. In a stationary tucking and folding mechanism including atucker blade means and at least a first folder member forming a planarwall structure including a slot having a substantially uniform width andlocated between the tucker blade means and the folder member, saidmechanism being mountable along a path traveled by an article having awrapper extension section projecting outwardly from the edges thereof,said mechanism being effective to form a tucked portion and then bend anoverfold portion thereover as the article moves along the path, saidfolder member including: a. a folding surface, a concave gradualpressing surface and a flat pressing surface, b. said slot having aconfiguration to receive the overfold portion of the extension sectionand cause the overfold portion to bend inwardly with respect to thearticle over the tucked portion, and c. said folding surface and gradualpressing surface being contiguous to said slot configuration.
 9. In astationary tucking and folding mechanism including a tucker blade meansand at least a first folder member forming a wall structure having aslot located between the tucker blade means and the folder member, saidmechanism being mountable along a path traveled by an article having awrapper extension section projecting outwardly from the edges thereof,said mechanism being effective to form a tuck portion in the extensionsection along a first edge of the article and then bend an overfoldportion thereover as the article moves along the paty, the combinationcomprising: a. a straight edge section located on the tucker blade meansand in overlapping relationship with respect to the first folder member,b. said slot having a configuration to receive the overfold portion ofthe extension section and cause the overfold portion to bend inwardlywith respect to the article over the tuck portion, c. said straight edgesection being disposed at a height along said path to be contiguous to asecond edge of the article to support the tuck portion beneath theoverfold portion at the crease line to prevent the tuck portion fromchanging position therebeneath while the first folder member acts tocrease the overfold portion along said second edge of an article, d. asecond folder member disposed adjacent said first folder member to formanother portion of the wall structure with a second slot located betweenthe first folder member and the second folder member, e. said secondslot having a configuration to receive a second overfold portion of theextension section and cause the second overfold portion to bend inwardlywith respect to the article over the tuck portion and first overfoldmember, and f. a second straight edge section located on the firstfolder member and in overlapping relationship with respect to the secondfolder member, g. said second straight edge section being disposed at aheight along said path to be contiguous to a third edge of the articleto support the tuck portion beneath the second overfold portion at thecrease line to prevent the tuck portion from changing positiontherebeneath while the second folder member acts to crease the secondoverfold portion along said third edge of the article, h. saidstationary tucker blade means and said first folder member having planarsurfaces disposed in a first plane which is parallel to the movement ofthe intersecting side of the article past the assembly, and i. saidsecond straight edge section of said first folder member is disposed insaid first plane, j. said second folder member includes an inclinedfolding edge portion which is disposed in a second plane that intersectssaid first plane to prevent bunching of the wrapper material between thesecond straight edge section and the inclined folding edge portion ofsaid second folder member.